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The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s flora taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not currently being reflected in Florabase, herbarium collections, or the census. The project team is now conducting testing of the migrated data, and a further update will be provided by the end of the financial year (1 July). Please reach out to us if you have any questions or concerns.

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Hypoglossum barbatum Okamura

Reference
Ill.Mar.Algae Japan 19, Pl. VII (1901)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus with prostrate and erect leaf-like branches to 2 cm long, attached by a primary holdfast and at several points by clustered rhizoids arising from the blade margins. Branching up to 3 orders; branches arising from the midline, on one surface, alternately or unilaterally every 9–11 axial cells but with occasional intercalation of secondary branches. Additional branches arising from the basal segment of parent axes, giving the appearance of subopposite branches. Blades linear-lanceolate, to 1.5 mm wide, with attenuate apices. Structure with all cells of second-order rows bearing third-order rows.

Reproduction. Spermatangia in discrete sori on both sides of the midline, often from individual cells of alae, occasionally becoming confluent. Tetrasporangia spherical, tetrahedrally divided, 60–70 µm diam., in elongate sori over the midline, the lateral pericentral cells involved in sporangial production.

Distribution. This species is possibly widespread in tropical seas.

[After J.M. Huisman & S.-M. Lin in Algae of Australia: Marine Benthic Algae of North-western Australia, 2. Red Algae: 462 (2018)]